The best way to save your money is to lock them in your bank (saving accounts) for a specific period. Saving is a habit that must be developed from your childhood and parents have to play there part to teach there kids about this habit.
You need to take a look with recent FTX bankruptcy, it's the best reason why you shouldn't trust any centralized platform and even it's really popular, there's still a chance your money will gone.
I do not seem to get what you are saying, he is talking about bank but you are talking about centralized exchanges, banks are centralized too but they are not the same as exchanges because all of us use bank. People have different means of savings, but he go with the opinion that people should have fixed deposit in a way the money will not be accessible for sometimes so that he will not be able to spend it, there is nothing like centralized exchange or coins that he talked about.